docs: def open(filename, frame='unspecified'):
          """Create a Point from data saved in a file.
  
          Parameters
          ----------
          filename : :obj:`str`
              The file to load data from.
  
          frame : :obj:`str`
              The frame to apply to the created point.
  
          Returns
          -------
          :obj:`Point`
              A point created from the data in the file.
          """
          data = BagOfPoints.load_data(filename)
          return Point(data, frame)